Skip to Main Content
C# in a Nutshell
book

C# in a Nutshell

by Ben Albahari, Ted Neward, Peter Drayton
March 2002
Intermediate to advanced content levelIntermediate to advanced
864 pages
31h 8m
English
O'Reilly Media, Inc.
Content preview from C# in a Nutshell

Name

AttributeTargets

Synopsis

This enumeration is used to set the AttributeUsageAttribute.ValidOn property when creating a custom attribute. It allows you to specify the code elements for which a custom attribute can be used. You can use a bitwise combination of these values to specify multiple elements.

Using this attribute is the only means by which a custom attribute can declare a restriction of its usage against various metadata types. For example, when using the System.Reflection.AssemblyKeyFileAttribute attribute, which simply tells the compiler which public/private keyfile to use to sign the assembly, it makes no sense to apply to any other metadata type besides the assembly. Therefore, the AssemblyKeyFileAttribute attribute has an AttributeUsageAttribute (see the AttributeUsageAttribute entry) declared on it with the value Assembly. As a result, any attempt to use the AssemblyKeyFileAttribute attribute on anything other than an assembly results in a compilation error.

public enum AttributeTargets {
            Assembly = 0x00000001,
            Module = 0x00000002,
            Class = 0x00000004,
            Struct = 0x00000008,
            Enum = 0x00000010,
            Constructor = 0x00000020,
            Method = 0x00000040,
            Property = 0x00000080,
            Field = 0x00000100,
            Event = 0x00000200,
            Interface = 0x00000400,
            Parameter = 0x00000800,
            Delegate = 0x00001000,
            ReturnValue = 0x00002000,
            All = 0x00003FFF
}

Hierarchy

ObjectValueTypeEnum(IComparable, IFormattable, IConvertible)AttributeTargets

Returned By

AttributeUsageAttribute.ValidOn

Passed To

AttributeUsageAttribute.AttributeUsageAttribute() ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

C# 8.0 in a Nutshell

C# 8.0 in a Nutshell

Joseph Albahari, Eric Johannsen
C# 10 in a Nutshell

C# 10 in a Nutshell

Joseph Albahari
C# in a Nutshell, Second Edition

C# in a Nutshell, Second Edition

Peter Drayton, Ben Albahari, Ted Neward
Code like a Pro in C#

Code like a Pro in C#

Jort Rodenburg

Publisher Resources

ISBN: 0596001819Catalog PageErrata